Hi @Tony-R, welcome to the community.
You are extremely lucky that you took out travel insurance to cover damage caused to a hire car. I hope you were not injured in the recent accident.
If ‘who is responsible for the crash’ hasn’t been confirmed, car hire companies withhold any refunds until such time it is confirmed. This is because until this is confirmed, the car hire company may be liable for the damage caused to the other car.
While it may be straightforward in your case that a car ran into the back of you, a car hire company will need to confirm you aren’t responsible for damage to the other vehicle. They may be unable to prove that you didn’t roll back into a stationary car behind you or reversed into another car for example. The other driver might be also making such claims trying to push blame to you/Ace Rental Cars.
It would be interesting to know if Ace Rental Cars or its insurer has confirmed responsibilities associated with the crash. Has this question been asked? Until this is done, it is unlikely you will have any success taking it further.
If the other driver claims that you reversed into them, it becomes a ‘I said - they said’ scenario. If the police weren’t involved, then the car’s insurer may then determine who they believe is ultimately responsible based on balance, with the information provided to them by both parties. Hopefully this doesn’t occur, but if it does, a possible outcome could include determining that you are responsible for the damage to the other car. This means the $1394.14 won’t be the total amount you are liable for.
Until responsibilities are known, it may not be possible to receive a refund as there could be outstanding liabilities associated with damage to the other vehicle. It is worth noting that if the other party is fully responsible, you may be within your rights (or your travel insurer) to make a claim against the other driver for all costs associated with damage to the hire vehicle.
Ace Rental Terms and conditions are also likely to state the process associated with damage to its rental vehicles.
Should Ace Rental Cars are unwilling to resolve the crash responsibilities and any refunds associated with the crash, it may also be worth gaining legal advice to determine the best approach to gain any refund, if any, you are entitled to. @grahroll has posted elsewhere in the community where to seek legal advice should it be needed by a consumer.